"Harley Davidson Topper" sounds nicely lurid, like some kinkster Craigslist Personals category ("HDT seeks BBF for Swamp Riding--No Insurance Salesmen, Furries or other freaks please"), so it does have that going for it.
In case one is interested in this rather peculiarly constructed breed of scooter, Michael Waller of "Britannia Motorcycles" YouTube channel fame got right down into the weird guts of one in 7 parts, beginning here:
https://youtu.be/Dl0jvCl4XSg